Question

将poi HSSFWorkBook数据写入ByteArrayOutputStream时遇到了一些麻烦。当工作簿超过10MB时发生异常。

private Workbook currentWB;

public DataSource getDataSource() throws Exception {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    try {
        **currentWB.write(out);  <-Exception occurs in this line, when workbook writing in  outputstream**
    } finally {
        out.close();
    }
    return new XLSDataSource (TEMPLATE_FILE_NAME, out.toByteArray());
}

 private static class XLSDataSource implements DataSource {
    private final String name;
    private final byte[] content;

    private XLSDataSource(String name, byte[] content) {
        super();
        this.name = name;
        this.content = content;
    }

    @Override
    public String getContentType() {
        return "application/vnd.ms-excel";
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(content);
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public OutputStream getOutputStream() throws IOException {
        throw new UnsupportedOperationException();
    }
}

StackTrace：

java.lang.OutOfMemoryError：Java堆空间 at java.util.Arrays.copyOf（Arrays.java:2786） at java.io.ByteArrayOutputStream.write（ByteArrayOutputStream.java:94）在java.io.OutputStream.write（OutputStream.java:58）在org.apache.poi.poifs.storage.BigBlock.doWriteData（BigBlock.java:55）在org.apache.poi.poifs.storage.BATBlock.writeData(BATBlock.java:227）在org.apache.poi.poifs.storage.BigBlock.writeBlocks（BigBlock.java:86）在org.apache.poi.poifs.storage.BATBlock.writeBlocks(BATBlock.java:35）在org.apache.poi.poifs.storage.BlockAllocationTableWriter.writeBlocks（BlockAllocationTableWriter.java:151）在org.apache.poi.poifs.filesystem.POIFSFileSystem.writeFilesystem（POIFSFileSystem.java:398）在org.apache.poi.hssf.usermodel.HSSFWorkbook.write（HSSFWorkbook.java:1181） at uk.co.itrainconsulting.appbook.core.impl.service.exportBusinessData.XLSRenderer.getDataSource（XLSRenderer.java:79） at uk.co.itrainconsulting.appbook.core.impl.service.BusinessExportDataServiceImpl.getDataSource（BusinessExportDataServiceImpl.java:119） at uk.co.itrainconsulting.appbook.core.impl.service.BusinessExportDataServiceImpl.sendByEmail（BusinessExportDataServiceImpl.java:75） at uk.co.itrainconsulting.appbook.web.bean.BusinessExportDataBean.sendBusinessData（BusinessExportDataBean.java:71） at uk.co.itrainconsulting.appbook.web.bean.BusinessExportDataBean $$ FastClassByCGLIB $$ 307f293f.invoke（）在net.sf.cglib.proxy.MethodProxy.invoke（MethodProxy.java:191）在org.springframework.aop.framework.Cglib2AopProxy $ CglibMethodInvocation.invokeJoinpoint（Cglib2AopProxy.java:689）在org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:150）在org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed（DelegatingIntroductionInterceptor.java:131）在org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke（DelegatingIntroductionInterceptor.java:119）在org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:172）在org.springframework.aop.framework.Cglib2AopProxy $ DynamicAdvisedInterceptor.intercept（Cglib2AopProxy.java:622） at uk.co.itrainconsulting.appbook.web.bean.BusinessExportDataBean $$ EnhancerByCGLIB $$ 1bb626b3.sendBusinessData（） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）在java.lang.reflect.Method.invoke（Method.java:597）在com.sun.el.parser.AstValue.invoke（AstValue.java:234） at com.sun.el.MethodExpressionImpl.invoke（MethodExpressionImpl.java:297） at com.sun.faces.facelets.el.TagMethodExpression.invoke（TagMethodExpression.java:102） at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke（MethodBindingMethodExpressionAdapter.java:84）在org.springframework.faces.webflow.FlowActionListener.processAction（FlowActionListener.java:81） 2014年8月12日下午5:49:50 org.apache.catalina.core.StandardHostValve throwable 警告：异常处理ErrorPage [exceptionType = java.lang.Throwable，location = / error / internalServerError.jsf] ClientAbortException：java.net.SocketException：软件导致连接中止：套接字写入错误在org.apache.catalina.connector.OutputBuffer.doFlush（OutputBuffer.java:330）在org.apache.catalina.connector.OutputBuffer.flush（OutputBuffer.java:296）在org.apache.catalina.connector.Response.flushBuffer（Response.java:549）在org.apache.catalina.core.StandardHostValve.throwable（StandardHostValve.java:272） at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:141）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:103）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:109）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:293）在org.apache.coyote.http11.Http11Processor.process（Http11Processor.java:861）在org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process（Http11Protocol.java:606）在org.apache.tomcat.util.net.JIoEndpoint $ Worker.run（JIoEndpoint.java:489）在java.lang.Thread.run（Thread.java:662）引起：java.net.SocketException：软件导致连接中止：套接字写入错误 at java.net.SocketOutputStream.socketWrite0（Native Method）在java.net.SocketOutputStream.socketWrite（SocketOutputStream.java:92）在java.net.SocketOutputStream.write（SocketOutputStream.java:136）在org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes（InternalOutputBuffer.java:761）在org.apache.tomcat.util.buf.ByteChunk.flushBuffer（ByteChunk.java:448）在org.apache.coyote.http11.InternalOutputBuffer.flush（InternalOutputBuffer.java:318）在org.apache.coyote.http11.Http11Processor.action（Http11Processor.java:987）在org.apache.coyote.Response.action（Response.java:186）在org.apache.catalina.connector.OutputBuffer.doFlush（OutputBuffer.java:325） ......还有11个

Answer 1

我目前正在使用相同的lib，从来没有处理过这么大的文件（10MB）。据我所知，这里唯一的限制是＆gt; 65K行和> XLSX的100万列。使用Writer时也要小心，因为此操作相对较慢。 OutOfMemoryError不仅可以由POI lib的使用引起。

更新

我目前正在使用更新的XLSX格式（我不知道这是否重要）并使用它如下：

`

FileOutputStream fileOutputStream = new FileOutputStream(file)) { 
 workbook.write(fileOutputStream); 
 fileOutputStream.flush();
 fileOutputStream.close(); }

`

我也用：

File file = new File(relativePath);

请注意.close（）

之前有.flush（）

OutOfMemoryError：将poi.WorkBook写入ByteArrayOutputStream时的Java堆空间

1 个答案: